In addition to Twitter, YouTube has been a critical tool to spread videos from Iran when traditional media outlets have had difficulty filming the protests or the ensuing crackdown. One YouTube account, bearing the user name “wwwiranbefreecom,” showed disturbing images of police officers beating people in the streets. On Monday, Lara Setrakian, an ABC News journalist, put out a call for video on Twitter, writing, “Please send footage we can’t reach!”…“We’ve been struck by the amount of video and eyewitness testimony,” said Jon Williams, the BBC world news editor. “The days when regimes can control the flow of information are over.”